LTC2485CDD datasheet(35/40 Pages) LINER

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LTC2485

2485fa

LTC2485.c

Basic voltmeter test program for LTC2485

Reads LTC2485, converts result to volts,

and prints voltage to a 2 line by 16 character LCD display.

Mark Thoren

Linear Technonlgy Corporation

June 23, 2005

Written for CCS PCM compiler, Version 3.182

#include “LTC248X.h”

/*** read_LTC2485() ************************************************************

This is the funciton that actually does all the work of talking to the LTC2485.

Arguments:

addr - device address

config - configuration bits for next conversion

Returns:

zero if conversion is in progress,

32 bit signed integer LTC2485 output word.

the i2c_xxxx() functions do the following:

void i2c_start(void): generate an i2c start or repeat start condition

void i2c_stop(void): generate an i2c stop condition

char i2c_read(boolean): return 8 bit i2c data while generating an ack or nack

boolean i2c_write(): send 8 bit i2c data and return ack or nack from slave device

These functions are very compiler specific, and can use either a hardware i2c

port or software emulation of an i2c port. This example uses software emulation.

A good starting point when porting to other processors is to write your own

i2c functions. Note that each processor has its own way of configuring

the i2c port, and different compilers may or may not have built-in functions

for the i2c port.

When in doubt, you can always write a “bit bang” function for troubleshooting

purposes.

The “fourbytes” structure allows byte access to the 32 bit return value:

struct fourbytes

// Define structure of four consecutive bytes

{

// To allow byte access to a 32 bit int or float.

int8 te0;

int8 te1;

// The make32() function in this compiler will

int8 te2;

// also work, but a union of 4 bytes and a 32 bit int

int8 te3;

// is probably more portable.

};

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